Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac58a161d596381…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 17:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3460928443ac859adad2742487129299 SHA-1: 5cad6e37e245c8f8107c49b578837dcb5bba2763 SHA-256: 9ac58a161d596381f5cc89697d74018a05e67235834090b5a28edc1e2b55b771
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to obscure the true malicious destination and evade detection. The presence of many unknown URLs further supports this phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tipsclubcr.com/campannas/file/4663216585.pdf In PDF document text
    • http://md-servicios.com/userfiles/file/wetepaxogid.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/sapepinibimufunilotawuti.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/xunuvusumat.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/79130692746.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/fufes.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/fawabinakomob.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/nibezizojarurubola.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/70675549175.pdfIn PDF document text
    • https://viettrungson.com/media/Files/sanegivi.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/kuwezas.pdfIn PDF document text
    • https://tommytest.dish1314.com/data/html_editor/files/zanalavoreriwuwen.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasijawademo.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/65574253274.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/85426238564.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/furabuxonebalutopitim.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/26593748737.pdfIn PDF document text
    • https://ferropula.hr/files/31991290994.pdfIn PDF document text
    • https://beautydent.hu/editor_up/80732692389.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/46175354554.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/69753545286.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210916231011.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/zemunoditenipofepaba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wps+wpa+tester+old+version+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC9 14644 bytes
SHA-256: a9759af0746495037e8967f1464eb47ec829055738a9b6cd31b791a20a7a0cac
font_01_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 10532 bytes
SHA-256: 53910e0df68ac436c2cf510d6fe08d8801c1c382837dd43efe3fd17ad730632e
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1